[ChristianTroy]

Thanks, so I think it should be an amplayer patched that before starting playback does that stuff (if it was a framework modification where there are Amlogic patches to add regular Android MediaPlayer support it would not work with Kodi that uses directly libamplayer)

Edit: I still think that the best solution would be a daemon that parses /sys/class/video/frame_rate but it reports "floating" values, 59.94 would be undetectable (and also sometimes reports erroneous values, like when watching TV and changing channels, it needs some time to assest and it's slow, the change would happen like with 2/3 seconds delay to wait it to settle)